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 *
 * @APPLE_LICENSE_HEADER_START@
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 * Copyright (c) 1999-2008 Apple Inc.  All Rights Reserved.
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 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
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 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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/*
    File:       RTCPAckPacket.cpp

    Contains:   RTCPAckPacket de-packetizing class

    
*/


#include "RTCPAckPacket.h"
#include "RTCPPacket.h"
#include "MyAssert.h"
#include "OS.h"
#include "OSMemory.h"
#include "OSArrayObjectDeleter.h"
#include <stdio.h>


// use if you don't know what kind of packet this is
Bool16 RTCPAckPacket::ParseAckPacket(UInt8* inPacketBuffer, UInt32 inPacketLength)
{
        
    if (!this->ParseAPPPacket(inPacketBuffer, inPacketLength))
        return false;
        
    if (this->GetAppPacketName() == RTCPAckPacket::kAckPacketName)
        return true;
        
    if (this->GetAppPacketName() == RTCPAckPacket::kAckPacketAlternateName)
        return true;
          
    return false;

}


Bool16 RTCPAckPacket::ParseAPPData(UInt8* inPacketBuffer, UInt32 inPacketLength)
{
    if ( !this->ParseAckPacket(inPacketBuffer, inPacketLength) )
        return false;


    fRTCPAckBuffer = inPacketBuffer;

    //
    // Check whether this is an ack packet or not.
    if ( (inPacketLength < kAckMaskOffset) || (!this->IsAckPacketType() ) )
        return false;
    
    Assert(inPacketLength == (UInt32)((this->GetPacketLength() * 4)) + RTCPPacket::kRTCPHeaderSizeInBytes);
    fAckMaskSize = inPacketLength - kAckMaskOffset;
    
    return true;
}

Bool16 RTCPAckPacket::IsAckPacketType()
{
    // While we are moving to a new type, check for both
    UInt32 theAppType = this->GetAppPacketName();
    
//  if ( theAppType == kAckPacketAlternateName ) qtss_printf("ack\n"); 
//  if ( theAppType == kAckPacketName ) qtss_printf("qtack\n");
                                                        
    return this->IsAckType(theAppType);
}

void   RTCPAckPacket::Dump()
{
    UInt16 theSeqNum = this->GetAckSeqNum();
    UInt16 thePacketLen = this->GetPacketLength();
    UInt32 theAckMaskSizeInBits = this->GetAckMaskSizeInBits();
    
    char name[5];
    name[4] = 0;
    
    ::memcpy(name, &fRTCPAckBuffer[kAppPacketTypeOffset],4);
    UInt16 numBufferBytes = (UInt16) ( (7 * theAckMaskSizeInBits) + 1 );
    char *maskBytesBuffer = NEW char[numBufferBytes];
    OSCharArrayDeleter deleter(maskBytesBuffer);
    maskBytesBuffer[0] = 0;
    maskBytesBuffer[numBufferBytes -1] = 0;
    for (UInt32 maskCount = 0; maskCount < theAckMaskSizeInBits; maskCount++)
    {
        if (this->IsNthBitEnabled(maskCount))
        {
            qtss_sprintf(&maskBytesBuffer[::strlen(maskBytesBuffer)],"%"_U32BITARG_", ", theSeqNum + 1 + maskCount);
        }
    }
    Assert(::strlen(maskBytesBuffer) < numBufferBytes);
    qtss_printf(" H_name=%s H_seq=%u H_len=%u mask_size=%"_U32BITARG_" seq_nums_bit_set=%s\n",
                                    name, theSeqNum,thePacketLen,theAckMaskSizeInBits, maskBytesBuffer);

}

